Includes custom buffer tube for the Blade. The class 3 hard-anodized tube features 12 length-adjustment settings. Its anti-rotation and anti-thrust design mean that the Blade stays put without sliding forward or spinning. The tube is flush with rear of Blade when it’s installed fully forward. When installed fully out, the assembly is incredibly rigid. Being of the castle nut design, the KAK Shockwave tube accepts all carbine buffer systems, mil-spec receiver endplates, and aftermarket endplates.